I remember liking this chem a lot. At 15mg, the body high and euphoria were similar to a high dose of Ritalin/Adderall. It felt a bit eccentric/unnatural, but I thoroughly enjoyed it on 2C-P as it lasted for over 24 hours. The visuals were pretty intense too. In darkness, shapes and colors were present, depending on the environment and my mindset. I remember taking it around midnight, and the sky is usually black but on this stuff, it turned the whole sky in my field of vision dark red-violet all throughout no matter where I turned. It tripped me out harder because it was constant, and everything just had a darker but more vivid shade to it. So the vividness was similar to mdma, but the colors were the opposite (where mdma usually brightens and makes colors pop out, 2C-P would instead make the colors darker and have more depth).
Closed eye visuals didn't have as many visuals per se, but it was like someone cast a web made of colors in the dark. I only remember it being a spectrum of light colors, eg. red, green, yellow, orange, purple and blue. But basically, never brown, white, gray, or any of their different shades.
The other trippy thing that would happen was that whenever I looked at a wall, red and blue writing would suddenly appear, like when one is going through the motion of writing from pen to paper. Sometimes it wasn't legible or it didn't make sense, and other times I could concentrate to make whatever word I was thinking about appear. But it was always a mix of red and blue "ink." Similarly, people's flesh, including my own, were almost see through as I could make out the pattern of their red and blue veins/arteries. Thankfully, I couldn't see their bones. Though this effect does tend to creep me out, since like lsd it makes people look...freaky?
I think 15mg was a really high dose for me. The dose response curve was the most ridiculous out of the limited chems I've tried. 5 and 10mg doses were like nothing and then almost nothing respectively. I either have to be in a sensitive mindset or have taken too high of a dose to get stuck in negative thought loops, but this did occur during the trip for about a couple of hours in total. But it was light in nature and just consisted of mild thoughts, nothing too negative or overwhelming at all. But it was pretty annoying because it was hard to get out of it. Once at around t+3 hours, and then t+8 hours. I think I slept around 9am (basically exhausted myself to sleep) and slept for about 2 hours, then woke up still at the plateau but the most notable thing was the feeling of waking up tripping hard as hell. That was my first time actually getting some sleep and still tripping to that extent because usually I can't sleep at all if I'm on something as strong as that. The peak was barely any different from the rest of the trip, and the plateau didn't budge for at least 16 hours. So after that it slowly faded until I had some weed, which I stopped smoking quickly because I wasn't in the mood to bring it back up too high.
No nausea during the trip, but the diarrhea was kinda bad. I think I had to go at least four times. I did feel pain around the left side of my abdomen, so this stuff did feel a bit toxic. It was pretty much a light, pulsating pain sensation not unlike the feeling of banging a knee against a table, but not nearly as painful. But it was there the whole time, basically for 2 days, and yeah I didn't like it. At least these are the only negative side effects I suffered, which is what I thought to myself while feeling high as hell and experiencing unique visuals open or closed eyed. They were certainly much more different than other chems I've tried, which is the reason I can recall parts of trip with clarity even though this trip was over 2 years ago. I definitely felt like I wasted the material in hindsight, but it was probably the right decision to work up the doses rather than jump in and regret it. I only ever had two 15mg caps of 2C-P crystals, and though I've sought them out I could never find it again.
That's all I can remember though. I'm sure I've missed some other things about the trip, but overall it was a nice, long lasting one with unique effects that persisted for over 24 hours straight.